
PCM30U, PCM30U-OCH – User's, Operating and Maintenance Manual
E.2.5.12 *) Doubled amplifier 50 Hz
When the 50Hz amplifier is doubled, it is necessary, together with the setting of the XJ300, also to set the
UOUT max at 100 Vrms on both channels (XJ1 and XJ103, XJ203) and to interconnect the output terminals
of the 50Hz signal OUT1A-OUT2A and OUT1B-OUT2B, i.e. the e6-e20 and e8-e22 terminals on the XC2
connector. Further, the 1-2 XJ104 terminals should be interconnected and no terminals should be installed
on XJ204 and XJ205. The output voltage and phase (dig. delay) of the 50Hz signal can be set by means of
the GAIN1 trimmer and +ms1 switch on the panel. After installation of jumper No. 1 on the XJ105 a small
analogue delay can also be set by the ±
ϕ
1 trimmer on the panel (large analogue delay and analogue phase
lead should not be used).
In the generator synchrnoisation (Synch. gen.) function, elements of the 1
st
channel are only used, i.e. the
XJ100 on the unit is set at the receiving direction function “p
ř
ij. Sm
ě
r (50 Hz-OUT)”, and XJ104, XJ105,
GAIN1, trimmer ±
ϕ
1 are used on the opposite unit, set at the transmitting direction function “vys. Sm
ě
r (50
Hz-IN)”, according to Note
**
).
E.2.5.13 **) Setting the feedback control channel (at setting B – Synch. gen)
XJ100, XJ200 at Synch. gen. is only installed on a unit set at the reception function of “receiving direction (50
Hz-OUT)”.
In addition, it is also necessary on this unit to set the UOUT (50 Hz) at max. 100 Vrms and to set the UIN (50
Hz) at max, 110 Vrms.
Then it is necessary on this unit to set the output voltage of the 50Hz signal (using the GAIN1, GAIN2
trimmers on the panel) and compensate the construction phase lead of the RO4 unit’s 50Hz signal (about
+0.7ms, lowered by the delay given by the transmission of the 2 Mbit/s signal), using a combination of digital
delay (switches SW1, SW2 on the panel) and the smallest possible analogue delay (XJ104, XJ204: 1-2, and
XJ105, XJ205: jumper No. 1 and trimmers ±
ϕ
1, ±
ϕ
2 on the panel) to ensure conformity of the voltage
transferred from the transmission direction (50 Hz-IN) with the miror of the voltage of the local generator
connected to the power lines.
On the opposite unit set at the transmission function of “transmitting direction (50 Hz-IN)”, it is necessary to
set the XJ104, XJ204 at a small analogue phase lead, i.e. interconnect terminals 3-4 and install jumpers
No.4 on the XJ105, XJ205, and use the GAIN1, GAIN2 trimmers and ±
ϕ
1, ±
ϕ
2 trimmers again to fine-tune
on the unit’s panel the feedback control signal to ensure conformity with the local signal so that the unit
reliably assessers the signals as conforming. Then the jumpers can be removed from the XJ104, XJ204 to
ensure that the 50Hz end amplifier is not unnecessarily working (during the fine-tuning of the feedback
control signal, the 50Hz output was temporarily used as a signal source for the connected test oscilloscope).
Power Channel Modules
E-37
446S037.914.14N00